Long Range Mountains was created by the 2012 federal electoral boundaries redistribution and has been legally defined in the 2013 representation order. It came into effect upon the call of the 42nd Canadian federal election, scheduled for October 2015. It was created out of the electoral districts of Humber—St. Barbe—Baie Verte (65%) and Random—Burin—St. George's (35%).

The riding includes the entirety of the west coast of Newfoundland.

The official description of the electoral district, as offered by Elections Canada states that it is "All that area consisting of that part of the Island of Newfoundland lying westerly and southerly of a line described as follows: commencing at the mouth of Chaleur Bay; thence generally northwesterly along said bay to the end of said bay; thence westerly in a straight line to the most southerly point of Dry Pond at approximate latitude 47°50'25"N and approximate longitude 57°31'17"W; thence northerly in a straight line to the mouth of Lloyds River at the westernmost extremity of Red Indian Lake; thence northerly in a straight line to a point in Hinds Lake at latitude 48°57'49"N and longitude 56°59'36"W; thence northerly in a straight line to the southeasternmost point of the limit of the Town of Hampden; thence generally northerly along the easterly limit of said town to the northeasternmost point of the limit of said town; thence easterly in a straight line to a point in White Bay at latitude 49°34'31"N and longitude 56°50'24"W; thence generally northerly along said bay to the Atlantic Ocean.

Including Ramea Islands, Sops Island, Bell Island, Groais Island of the Grey Islands, Quirpon Island, St. John Island and all other islands adjacent to the shoreline of the above-described area."

Ethnic groups: 82.4% White, 17.1% Aboriginal
Languages: 98.7% English
Religions: 95.4% Christian (36.7% Anglican, 34.4% Catholic, 10.5% United Church, 6.5% Pentecostal, 7.3% Other), 4.4% No religion
Median income (2010): $22,576
Average income (2010): $30,470

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